combo/apps/dataviz/models.py

@@ -609,6 +609,11 @@ class ChartNgCell(CellBase):
     def add_total_to_line_table(chart, data):
         # workaround pygal
         chart.compute_sum = False
+
+        # do not add total for single point
+        if len(data) <= 1:
+            return data
+
         data.append(sum(x for x in data if x is not None))
         chart.x_labels.append(gettext('Total'))
         return data

tests/test_dataviz.py

@@ -1954,6 +1954,12 @@ def test_table_cell_new_api(app, admin_user, new_api_statistics):
     resp = app.get(location)
     assert resp.text.count('Total') == 0
 
+    # no total for single point data
+    cell.statistic = Statistic.objects.get(slug='empty-x-labels')
+    cell.save()
+    resp = app.get(location)
+    assert resp.text.count('Total') == 0
+
 
 def test_dataviz_hourly_unavailable_statistic(statistics, nocache):
     all_stats_count = Statistic.objects.count()